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Originally Posted by streetfytr68
Your ECU is calibrated for an entirely different car: Different converter, different gear, different tire diameter different vehicle weight. So you can get LS1Edit, find a local LS1Edit tuner, or get an aftermarket transmission controller. All of those options have pros and cons. Regardless of which path you choose, you will find that a properly calibrated transmission will function and feel like an entirely different car (a much better car). In the case of Bill Howell's transmission, it was so far off, the difference was like going from a 307 2bbl (before) to his blown LS1 (after). A traditional shift kit can still be beneficial for improving mechanical line pressure, but the calibration might still be way off. An effective digital calibration is the key.
With the calibration done, you will probably need to shift manually to compensate for wheelspin. A quick, low rpm 1-2 shift can help.
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I had the ECM tuned for the engine mods, tire size, and gear ratio. My buddy hooked up his tech II a while back and monitored the functions. He seems to think it is a mechanical issue, but I can't rule out the tune as it was a mail order job (from a very reputable tuner).
Bill....did yours ever hang in gear and bounce off the rev limiter? We were listening to the video of the track run last night and MAN...it is like the car went on pause for a full second plus between shifts on a couple of runs.
For whatever reason, even after you manually move it into the next gear, it still shifts on its own when it feels like it ONLY after hanging up at the rev limiter and bouncing back a few times.